drm/i915/gt: Only swap to a random sibling once upon creation

The danger in switching at random upon intel_context_pin is that the
context may still actually be inflight, as it will not be scheduled out
until a context switch after it is complete -- that may be a long time
after we do a final intel_context_unpin.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2118
Fixes: 6d06779e8672 ("drm/i915: Load balancing across a virtual engine")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: <stable@vger.kernel.org> # v5.3+
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200713160549.17344-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 028d698..e0280a6 100644 (file)
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -5432,13 +5432,8 @@ static void virtual_engine_initial_hint(struct virtual_engine *ve)
         * typically be the first we inspect for submission.
         */
        swp = prandom_u32_max(ve->num_siblings);
-       if (!swp)
-               return;
-
-       swap(ve->siblings[swp], ve->siblings[0]);
-       if (!intel_engine_has_relative_mmio(ve->siblings[0]))
-               virtual_update_register_offsets(ve->context.lrc_reg_state,
-                                               ve->siblings[0]);
+       if (swp)
+               swap(ve->siblings[swp], ve->siblings[0]);
 }
 
 static int virtual_context_alloc(struct intel_context *ce)
@@ -5451,15 +5446,9 @@ static int virtual_context_alloc(struct intel_context *ce)
 static int virtual_context_pin(struct intel_context *ce)
 {
        struct virtual_engine *ve = container_of(ce, typeof(*ve), context);
-       int err;
 
        /* Note: we must use a real engine class for setting up reg state */
-       err = __execlists_context_pin(ce, ve->siblings[0]);
-       if (err)
-               return err;
-
-       virtual_engine_initial_hint(ve);
-       return 0;
+       return __execlists_context_pin(ce, ve->siblings[0]);
 }
 
 static void virtual_context_enter(struct intel_context *ce)
@@ -5806,6 +5795,7 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
 
        ve->base.flags |= I915_ENGINE_IS_VIRTUAL;
 
+       virtual_engine_initial_hint(ve);
        return &ve->context;
 
 err_put: